Adjusting device for fuel injection pumps



Oct. 14, 1941. H, L|NK$ 2,258,655

- ADJUSTING DEVICE Fon FUEL INJECTION PUMPS Filed Sept. 24, 1940 2 Sheets-Sheet l lnvenfor: HEINZ LINK Oct. '14, 1941. y H, lNKs 2,258,655

ADJUSTING DEVICE FOR FUEL INJECTION PUMPS Filed sept.' 24, 1940 2 sheets-sneu 2 j lnvenor:

HEINZ LINKS www@ ZHorneys Patented Oct.A 14, 1941 Heini:- Links', Gaggenau, Germany, assigner y `to Daimler-BenzI Aktiengesellschaft, Stuttgart,

Germany Application September 24, 1940, Serial No. 358,110

` In Germany October 2, 1939.

s claims. (ci. 10a-1) gear serving in cooperation with a longitudinal In multi-cylinder combustion engines, tlie injection pumps, as a rule,show a series of plungers placed side by side within a common body and corresponding to the number of cylinders xating. In this instance, the regulation or the injection pump is being eiected from a common 'governor rod or actuating shaft which mostly is ydeveloped as a rack engaging a pinion at the plunger. During its movement in axial direction, the rack in question will bring about a certain torsion of the `plunger and thus, the desired adi justment of the plunger governing edge. In orl der to obtainthe best regulation, the plungers have to be adjusted one by one. For this purpose, the governor rod has not been carried out in the individual tooth-pieces :or elements haveb'een provided for upon the governor. rod axially .ad`

- shape of a rack extending fromvend to end, but

instable in relation to the latter andjcapablg'oi" 'being iixed in position. f*

In fact, such axial .adjustability o i the tooth-.

pieces permitted only? a. rather rough regulation. It has been tried therefore, to do away withthis drawback by providing lthe governoro'r actuating-rod with an external thread passing from end to end, unto which the tooth. elements were screwed in the form of liners with outside cog- Iging. l With a view to preserve the liners from accidental twisting relative to the actuating shaft in course of working, the liners were made with longitudinal slotsl as guides which cooperated` with guide stops o'r plugs which for the purpose ofadjustingthe liners had to be put out of gear.

hole -in the liner and/or with a guide slot around the governor rod to'perform the iine rotary adjustme'nt of the liner.

.The peripheral guide-slot and/or longitudinal.

hole aforesaid may be vertical o r oblique in respect of the governor rod axle. In case of vertical disposition, thetorsion of the plunger is dependent on the gear .ratio of the helical gear only.

'Ihe longitudinal hole arrangement may equally be used in -conjunctionwith adjustable liners to be bolted on to the threaded governor rod in the manner already known, in which event of course the longitudinal hole must be of the same pitch as this thread.; A

Moreover, the joint regulation of the plungers takes place as usual by axial displacement of the actuating'rod. l l

The single adjustment of the plungers accord-- ing to the invention may of course be used iin the same way also-for other pumps, e. g.,v lubricating pumps for a plurality of points of con.

sumption. A

The enclosed drawings represent three possible ways of realising the object of this invention.

Hence, the -llners could only be twisted fromjslot to slot, i. e. gradually. Even by this arrangement, it was not possible to answer a best regulation.

The present invention#y is removing-this" draw back entirely by providing a single adjusting de-f* vice for the plungers of a fuel injection pump-to be regulated jointly, meains being provided which enable a`iinely adjustable axial displacement of each relative position between the liner and governor rod, preferably by a iinelyadiustable rof tary adjustment without steps of the liners above y described uponithe governor rod. Instead. of thel rotary displacement also a simple axial displace# therequlrements of Fig. 3 showsthe lsame section to vention in an injection pump.V

Fig- 1 shows a section through a longitudinal hole liner. with the governor rod having an outside thread;

-Finalsa.sectionverticauxFig.1;'`

Fig. l'ofa smooth governor rod with a peripheral guideslot;` ff

Fig. 4 is a vertical sectiorrwith regard to the latter with straight guide-slots:

Fig. 5 shows the arrangement of obliquel slots; y

Fig. 6 shows the device according to the in- Theisame parts are referred to byjthe same numbers in the various figures of the drawings.

l means the plunger, whereon a helical gear 2 untwistably fastened by means of two. fitting the liners of Ithe governor rod and a xingin surfaces which have been milled. In-.gear with Y this-helical gear is a worm segment 3 lilornied at A'45. i liner In the' embodiment according to Figs. 1- Aand 2, the hner I is sitting with its inside thread 'Iv upon the respective outside thread ofthe goverment may be chosen. For therst mentioned purpose, the liners are iitted to an as large fiinerl shows a longitudinal slot 'situated about as possible with a worm thread acting withf. av

helical gear at the' corresponding. plunger, ..a=

screwscrewed into the governor rod or'. into the liner at the side turned away from 'the point of engagement of the screw thread withr the helical one portion of the circumference of a cylindrical rior rod I capableof axial mpvement. On the side tumed away from part 3 of the thread, the

the middle of the lengthpf the-liner, substan- -tial1y extending in circumferential direction and inclined ,to its axle in conformity with the thread of the governor rodl. -The longitudinal slot comprises a screw 8 screwed into the governor shaft 5 at the sideturned away from the plunger. The longitudinal/ slot is wider in its external portion 1 than in the internal part 8. In the enlarged portion 1 lies the screw head, vwhereas the part 8 embraces the screw bolt with some play. It is obvious that in loosening the screw 6, the threaded liner can be screwed on the governor rod 5 in accordance with the length of the longitudinal slot 1, 8 resulting in a corresponding torsion of the plunger I and its governing edge 9. When tightening the screw 6, its head is being pressed against the step between the portions 1 and 8, so that the liner 4 will be pushed against the governor rod 5 and in this'way held in the position adjusted in relation to the governor rod. In the types according to Figs. 3-5, the regulating shaft 5 is smooth. Along this shaft slides the liner 4' which hasa center screw I0 counterbored into it. If the screw is loosened, the center top II of the screw I will slide in a slot I2 and/or I2` which is arranged vertically (Fig. 4) or obliquely` (Fig. 5) in relation to the governor shaft axle. Tightening the center screw will ilx the liner 4' in the adjusted position with regard to the governor rod.

I3 denotes the pump casing, I the pump plunger, I4 a compression spring, I5 a cam, 4 an consisting of individual tooth elements arranged on the governor rod and individually adjustable adjusting device to turn the plunger and/or trol plunger in the conveyor pipeline 24 leading'- to the nozzle not represented. a

Instead of a single bore for the center screw III, there may be provided more. e. g. three such bores, as shown by dotted lines in Fig. 3, so as to increase the adjusting range of 'the threaded liner accordingly.

Having now particularly describedand ascertained the nature of my said invention and in what manner the same is to be performed I declare that what I claim is:

1. Single adjusting device for the plungers of a pump with several points of consumption, to be regulated jointly. comprising a cylinder with a corresponding plunger, the stroke volume being adjustable by means of rotating the plunger provided with a stop, the l plunger being provided furthermore with a toothing which together with a toothing on the governor rod effects the rotation of the plunger, the toothing of the governor rod consisting of individual tooth elements arranged on the governor rod and individually adjustable independently of each other in respect to the latter in the form of liners, and finally means for effecting a finely adjustable and individual longitudinal displacement of the liners on the governor rod and furthermore a fixing in each position;

2. Single adjusting device for the plungers 'of a fuel injection pump for motor vehicles, to be *'60 tcothing on the governor rod Aeffects the rotation of the plunger, the tiothing of the governor rod independently of each other inrespect to the latter in the form of liners, and finally means for effecting a finely adjustabley and individual longitudinal displacement of the liners on the governor rod and furthermore a fixing in each position.

3. Single` adjusting device for the plungers of a fuel injection pump for motor vehicles according to claim 2, characterized in that the adjusting liners show on a part of their circumference a worm thread cooperating with a helical gear fastened to the respective plunger, while a screw fixed into the governor rod on the side turned away from the`point of engagement of the worm thread with thehhelical gear cooperates with a longitudinal hole in the liner' and is capable of rotatively adjusting and fixing the liner. f

4. Single adjusting device for the plungers of a fuel injection pump for motor vehicles according to claim 2, characterized in that the adjusting liners each show von a part of their circumference a worm thread cooperating with ahelical gear fastened to the respective plunger, while a screw fixed into the liner on the side turned away from the point of engagement of the worm thread with the helical gear cooperates with a longitudinal hole in the liner and is capable of rotatively adjusting andfixing the liner.

5. Single adjusting device for the plungers of a fuel injection pump for motor vehicles according to claim 2, characterized in that the adjusting liners each show on a part of their circumference a vworm thread cooperating with a helical gear fastened to the respective plunger, while a screw fixed into the governor rod on the side turned away from the point of engagement of the worm thread with the helical gear cooperates with a guide slot on the circumference of the governor rod and is capable of rotatively adjusting and fixing the liner.

6. Single adjusting device for the plungers of a fuel injection pump for motor vehicles according to claim 2, characterized in that the adjusting liners each show on a part of their circumscrew xed into the liner on the side turned away from the point of engagement of the worm thread with the helical gear cooperates with a guide slot on the circumference of the governor rod and is capable of rotatively adjusting and fixing the liner.

7. Single adjusting device for the plungers of a fuel injection pump for motor 4vehicles according to claim 2, characterized in that the circumferential guide-slot on the governor rod comprising the longitudinal hole of the liner is arranged vertically with regard to the governor rod.

8. Single adjusting device for the plungers of a fuel injection pump for motor vehicles accordi'ng to claim 2, characterized in that the circumferential guide-slot on the governor rod comprising the longitudinal hole of the liner is arranged obliquelyuwith regard to the governor rod.

HEINZ LINKS. 

